If the intern responsible for this has had a plan, he had already forgotten it, having long since graduated

The more I think about it the more I agree with BA850 though. I don't know if the trend was already there when the cabins were designed (not just F but also C with its eleventy million subcategories) but with higher and higher proportion of premium cabins going to leisure market, putting up cabins which will find purchase with influencers is... not the worst of ideas.
As we know, most influencers will sing praises of anything they are invited to take part of, so the parts that don't transfer through video can be neglected a bit. But these cabins give loads of opportunities for "content". If you consider it, it's like 3 different seat types just in F, that means not just one TikTok about the seat, but 3 TikToks about the seats, in the most basic terms... more content means more views means more exposure... etc.